Abstract
A robust method for geometrically nonlinear analysis of flexibly connected steel frames with hysteretic connection subjected to dynamic loads is presented. The proposed method revises the available monotonic moment vs rotation curves for typical connections to include the hysteretic loop characteristics for dynamic analysis of semi-rigid frames. Using this simple and efficient computer method of analysis, the influence of the nonlinear hysteretic loop for connection over the structural response in a large deflection range of a steel frame is studied. The extent of such an effect is quantified. It was found that neither the rigid nor the linear semi-rigid connection can predict accurately the response of moment frames where damping at connections is significant. Also, the use of several common connection models will generate similar load-deflection curves, indicating that the choice of these models may not be essential.
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